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Naya [18.7K]
2 years ago
7

What is the volume of a piece of metal that has a density of 6.68g.cm^3 and has a mass of 1975 g?

Chemistry
1 answer:
ryzh [129]2 years ago
3 0

Answer:  296 grams/cm^3 (3 sig figs)

Explanation:  Divide the mass by the volume to get grams/cm^3.

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How many molecules of NaOH are in 23<br> moles of NaOH
Ann [662]
120 grams of NaOH means 3 Moles of NaOH because 40 grams (Molecular Weight in grams) is one mole of NaOH.

Each mole of any substance contain Avogadro’s number of molecules ie., 6.022 x (10 to the power 23).

Hence 3 Moles of NaOH contain 3 times of Avogadro’s number of molecules ie., 3 x 6.022 x (10 to the power 23)
3 0
3 years ago
What is the oxidation number of carbon in the compound carbon dioxide, CO2?
Anna35 [415]

Answer:

the oxidation number is 4

7 0
3 years ago
When the pressure that a gas exerts on a sealed container changes from 22.5 psi to ? psi, the temperature changes from 110 degre
natta225 [31]
Using Gay-Lussac's Law, pressure is proportional to (absolute) temperature in Kelvin. We first convert the temperature values to Kelvin: 110 C = 383.15 K, while 65 C = 338.15 K.
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22.5/383.15 = P2/338.15
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8 0
3 years ago
Determina el pH del café cuya concentración de H+ es de 0.00001M
lara31 [8.8K]

Answer:

5

Explanation:

Given parameters:

Hydrogen ion concentration  =  0.00001M

Unknown:

pH of the solution =?

Solution:

The pH is used to estimate the degree of acidity or alkalinity of a solution. To solve for pH of any solution, we use the expression below;

          pH  = -log [H⁺]

[H⁺] is the hydrogen ion concentration

        pH  = -log (1 x 10⁻⁵)

      pH = -(-5) = 5

4 0
3 years ago
US<br> What is the percent of H in<br> NH3?<br> (H = 1.008 amu, N = 14.01 amu)<br> [?]%
Vlad [161]

Answer:

17.6

Explanation:

Answer is explained above

4 0
3 years ago
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